Method, program, and system for converting part of graph data to data structure as an image of homomorphism

Abstract

To provide a method, program, and system for converting graph data to a data structure that enables manipulations in various applications to be reflected in the original graph data. The method uses at least one graph matching pattern to convert at least a part of graph data including nodes and edges to a data structure as an image of a homomorphism thereof. A pattern is provided which includes one representative node variable having a first constraint that at most one node in the graph data matches the representative node variable; the node is prohibited from matching a node variable in another pattern. The method includes the step of performing matching between the graph data and the pattern to obtain a matching result that does not violate constraints including the first constraint, and the step of generating a data structure corresponding to the matching result that does not violate the constraints.

Description

CROSS REFERENCE TO RELATED APPLICATIONS[0001]This application is a continuation of U.S. patent application Ser. No. 13 / 474,364 filed on May 17, 2012, which claims priority from Japanese Patent Application No. 2011113360 filed on May 20, 2011 and entitled “Method, Program and System for Converting Part of Graph Data to Data Structure as an Image of Homomorphism”.FIELD OF THE INVENTION[0002]The present invention relates generally to an information processing technique for converting a data structure, and more particularly to a method, program, and system for converting a part of graph data to a data structure as an image of a homomorphism thereof.BACKGROUND ART[0003]Data of a graph structure with nodes and edges representing connection relationships between the nodes (hereinafter, which may be simply referred to as “graph data”) is often used to express a real world model on a computer. Graph data is generally described in accordance with a standardized format such as the resource des...

AI Technical Summary

Benefits of technology

The present invention provides a method for converting graph data to a data structure that allows manipulations of the data to be reflected in the original graph data. The method includes steps of matching graph data to a pattern, generating a data structure that does not violate the matching constraints, and removing information from the data structure that violates the constraints. The invention also provides a system for performing the method and a device for implementing the system. The technical effect of the invention is to enable proper manipulations of graph data in various applications and to reflect the manipulations in the original graph data.

Problems solved by technology

When graph data stored in a graph repository is to be used in an application, the graph data may be too complicated or include unnecessary details for that application.

Any of the background art, however, has failed to provide such a technique of converting graph data to an object that enables manipulations performed on the object in various applications to be properly reflected in the original graph data.

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